add currencies to preferences

electrum/gui/qml/qeconfig.py

@@ -68,6 +68,15 @@ class QEConfig(QObject):
         self.config.amt_add_thousands_sep = checked
         self.thousandsSeparatorChanged.emit()
 
+    fiatCurrencyChanged = pyqtSignal()
+    @pyqtProperty(str, notify=fiatCurrencyChanged)
+    def fiatCurrency(self):
+        return self.config.get('currency')
+
+    @fiatCurrency.setter
+    def fiatCurrency(self, currency):
+        self.config.set_key('currency', currency)
+        self.fiatCurrencyChanged.emit()
 
     @pyqtSlot(int, result=str)
     @pyqtSlot(int, bool, result=str)